About the coffee beans i don't know.
But what i do add when i have it laying around:
30/ 40 Gram palm asses per 15 L
30/40 Grams Kelp Per 15 L
10/20 Gram Power of bird feathers per 15 L
10/20 gram chicken droppings Per 15 L
10/20 Kali vinasse per 15 L
This style, I only grow in the tent/ room where i am in control. So i can react in time.
If you are growing with/ at your friends just follow the Biotabs instructions and all will be good!
Have to say with these products, there start a chance of over feeding the plant and getting things out of balance.
When experimenting with organic try little by little, or els it is hard to see what product is doing what